404 



THE GEOLOGIST. 



fruits occasionally met in the Lower Greensand beds, and which, 

 if they belong to either class, are more like Pandanaceous fruits 

 than Liliaceous. 



As I have found fragments of similar cavernous wood in the 

 Greensand of Folkestone, it is probable many more specimens may 

 be by diligence obtained ; and my impression is, that a large tree 

 I once saw split out like a picture on the surface of an enormous 

 block of ragstone in Mr. Bensted's quarry was a nearly perfect 

 specimen of the Braccena Bensfedii, or whatever other genus this 

 specimen may be proved to belong to. 



We have before drawn passing attention to some of the plants of 

 the British cretaceous rocks, and we wish again to do so now. It is 

 an unworked mine full of promise, and every labourer in it will meet 

 reward. 



ON THE EESTOEATION OE PTEEASPIS. 



By the Eey. Hugh Mitchell, M.A. 



In the year I860, when engaged in drawing 

 up a list of the fossils known to occur in the 

 Lower Old Eed Sand.stone of Scotland, we had 

 occasion to remark that, with the exception 

 of the Pteraspis, we had found in our northern 

 rocks the various fossils of the equivalent 

 beds in England, and many others besides, 

 indicating an extensive piscine fauna in that 

 epoch of geological history. "We have now 

 to remove that exception, for Pteraspis does 

 occur with us. Some very fine specimens 

 have recently been found in our Scottish 

 rocks, and from their examination we are not 

 only able to discern that fragments which 

 liave been many years in our possession, and 

 wiiich we could not refer to any known fossil, 

 belong to that palEeozoic fish, but we are also 

 encouraged to attempt the restoration of the 

 remarkable buckler, composed of solid bone, 

 in which this ancient denizen of the deep was 

 encased. 



Eigure 1. In the construction of this dia- 

 gram tliree fossil specimens have been em- 

 ployed. These specimens are similar in their 

 proportions and in the method of their pre- 



